Device-to-device (D2D) communication system is considered one of the most effective technology directions for solving the spectrum scarcity problem in 5G wireless communication. In this study, an electronic relay is proposed to be utilised in D2D communication. The electronic relay is a hybrid cooperative relay consisting of compress and forward relay with and without coding techniques, decode and forward relay and amplify and forward relay with variable gain. The selection of the most appropriate one has performed automatically according to the feedback channel state information. Additionally, the multipleinput multiple-output (MIMO) electronic relay with the multiuser and massive MIMO destination is introduced. The closed formulas of the outage probability for both cellular user and D2D transmission are derived. Furthermore, the analytical discussions for the proposed electronic relay are executed. Extensive MATLAB simulation programmes are executed to study the performance of the proposed system and to compare it with the conventional one. Moreover, the average sum rate is derived in terms of a number of electronic relay antennas and the D2D density through cellular networks.
In this paper, the cooperative electronic relay in device to device (D2D) communication system will be used which is not clarified until now. A scenario in our work will be made by using three types of cooperative diversities together that are compress and forward relay, decode and forward relay (DF) and amplify and forward relay (AF). Numerical results show that, the D2D outage probability of the proposed scheme is lower than that of the traditional relay transmission, which is further reduced with an increasing number of the electronic relays, therefore utilizing number of the electronic relay equal to 8 relays will reduce the outage probability by 0.0024 than using previous relays channel. Moreover using our proposed relay at SNR equal to 25 dB resulting in reducing BER by 4 dB. Moreover, the comparison between using proposed relay and previous research like AF relay with variable gain and DF relay will be carried out, where outage ratio will reduce to 15 dB using our proposed the electronic relay.
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